package com.module.third;

import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;

import java.util.Locale;

public class GpsUtil {
    static double pi = 3.14159265358979324;
    static double a = 6378245.0;
    static double ee = 0.00669342162296594323;
    public final static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

    public static double[] wgs2bd(double lat, double lon) {
        double[] wgs2gcj = wgs2gcj(lat, lon);
        double[] gcj2bd = gcj2bd(wgs2gcj[0], wgs2gcj[1]);
        return gcj2bd;
    }

    public static double[] gcj2bd(double lat, double lon) {
        double x = lon, y = lat;
        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
        double bd_lon = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        return new double[]{bd_lat, bd_lon};
    }

    public static double[] bd2gcj(double lat, double lon) {
        double x = lon - 0.0065, y = lat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
        double gg_lon = z * Math.cos(theta);
        double gg_lat = z * Math.sin(theta);
        return new double[]{gg_lat, gg_lon};
    }

    public static double[] wgs2gcj(double lat, double lon) {
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        double[] loc = {mgLat, mgLon};
        return loc;
    }

    private static double transformLat(double lat, double lon) {
        double ret = -100.0 + 2.0 * lat + 3.0 * lon + 0.2 * lon * lon + 0.1 * lat * lon + 0.2 * Math.sqrt(Math.abs(lat));
        ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lon * pi) + 40.0 * Math.sin(lon / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(lon / 12.0 * pi) + 320 * Math.sin(lon * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    private static double transformLon(double lat, double lon) {
        double ret = 300.0 + lat + 2.0 * lon + 0.1 * lat * lat + 0.1 * lat * lon + 0.1 * Math.sqrt(Math.abs(lat));
        ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }


    /**
     * 通过ExifInterface获取到的经纬度显示方式是112/1,58/1,390971/10000
     * https://www.jianshu.com/p/1d2672f20d9b
     * 需要通过下面方法转换
     */
    public static double score2dimensionality(String string) {
        double dimensionality = 0.0;
        if (null == string) {
            return dimensionality;
        }

        //用 ，将数值分成3份
        String[] split = string.split(",");
        for (int i = 0; i < split.length; i++) {

            String[] s = split[i].split("/");
            //用112/1得到度分秒数值
            double v = Double.parseDouble(s[0]) / Double.parseDouble(s[1]);
            //将分秒分别除以60和3600得到度，并将度分秒相加
            dimensionality = dimensionality + v / Math.pow(60, i);
        }
        return dimensionality;
    }

    // 获取地址信息

    /**
     * 获取地址信息
     * 耗时的，需要放在线程
     */
    public static Address getAddress(Context context, Location location) {
        Address result = null;
        try {
            if (context != null && location != null) {
                Geocoder gc = new Geocoder(context, Locale.getDefault());
                result = gc.getFromLocation(location.getLatitude(),
                        location.getLongitude(), 1).get(0);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

